| 摘要 |
PROBLEM TO BE SOLVED: To prevent noises from generating by providing a magnetic toothed disk having the same diameter as the gear on one side of the gear, and providing a different number of teeth from the gear on the toothed disc. SOLUTION: Gears 1, 7 meshing with each other are provided on shafts 3, 9. The gear 1 is a fixed gear and has a boss projection 4. A magnetic toothed disk 2 is provided on the projection 4. The number of teeth 10 of the magnetic toothed disc 2 is less than the number of teeth of the gear 1 by one. The magnetic toothed disc 2 is formed out of plastics having magnetic material. By combination of magnetic characteristic of the toothed disc 2 provided on the gear 1, the teeth of the loose gear 7 are always contacted with the teeth of the gear 1 or the toothed disc 2, and hence transmission noise is obstructed. By difference of the number of teeth between the gear 1 and the magnetic toothed disc 2, this effect is assisted, by displacement of the magnetic toothed disc 2 against the gear 1 generated in the engagement territory of gears, dragging moment is transmitted to the loose gear 7, and the loose gear 7 effectively absorbs the collision of even larger moment. |
